Ask whether to check for updates in the installer

Gets rid of the last annoying modal dialog on first startup.

packages/win_installer/aegisub3.iss

@@ -78,12 +78,24 @@ begin
 end;
 
 procedure CurStepChanged(CurStep: TSetupStep);
+var
+  Updates: String;
 begin
   CurStepChangedMigration(CurStep);
 
   if CurStep = ssPostInstall then
   begin
-    SaveStringToFile(ExpandConstant('{app}\installer_config.json'), ExpandConstant('{{"App": {{"Language": "{language}"}}'), False);
+    if IsTaskSelected('checkforupdates') then
+      Updates := 'true'
+    else
+      Updates := 'false';
+
+    SaveStringToFile(
+      ExpandConstant('{app}\installer_config.json'),
+      FmtMessage('{"App": {"Auto": {"Check For Updates": %1}, "First Start": false, "Language": "%2"}}', [
+        Updates,
+        ExpandConstant('{language}')]),
+      False);
   end;
 end;
 

packages/win_installer/fragment_mainprogram.iss

@@ -35,6 +35,7 @@
 [Tasks]
 Name: "startmenuicon"; Description: "{cm:StartMenuIcon}"; GroupDescription: "{cm:AdditionalIcons}"
 Name: "quicklaunchicon"; Description: "{cm:CreateQuickLaunchIcon}"; GroupDescription: "{cm:AdditionalIcons}"; Flags: unchecked
+Name: "checkforupdates"; Description: "{cm:CheckForUpdates}"; GroupDescription: "{cm:UpdatesGroup}"
 
 [Files]
 ; main

packages/win_installer/fragment_strings.iss

@@ -1,6 +1,8 @@
 [CustomMessages]
 InstallRuntime=Installing runtime libraries...
 StartMenuIcon=Create a start menu icon
+CheckForUpdates=Automatically check for new versions of Aegisub
+UpdatesGroup=Update Checker:
 
 ; Replacement for License page, no need to bother the user with legal mumbo-jumbo
 [Messages]

packages/win_installer/fragment_strings.iss.in

@@ -1,6 +1,8 @@
 [CustomMessages]
 _InstallRuntime=Installing runtime libraries...
 _StartMenuIcon=Create a start menu icon
+_CheckForUpdates=Automatically check for new versions of Aegisub
+_UpdatesGroup=Update Checker:
 
 ; Replacement for License page, no need to bother the user with legal mumbo-jumbo
 [Messages]

po/aegisub.pot

@@ -6202,6 +6202,16 @@ msgid "Create a start menu icon"
 msgstr ""
 
 
+#: packages/win_installer/fragment_strings.iss:1
+msgid "Automatically check for new versions of Aegisub"
+msgstr ""
+
+
+#: packages/win_installer/fragment_strings.iss:1
+msgid "Update Checker:"
+msgstr ""
+
+
 #: packages/win_installer/fragment_strings.iss:1
 msgid "This will install Aegisub {#BUILD_GIT_VERSION_STRING} on your computer.%n%nAegisub is covered by the GNU General Public License version 2. This means you may use the application for any purpose without charge, but that no warranties of any kind are given either.%n%nSee the Aegisub website for information on obtaining the source code."
 msgstr ""